參數(shù)資料
型號(hào)： RP-21203F3-870
廠商： DATA DEVICE CORP
元件分類(lèi)： 模擬信號(hào)調(diào)理
英文描述： SPECIALTY ANALOG CIRCUIT, PDSS20
封裝： FP-20
文件頁(yè)數(shù)： 18/20頁(yè)
文件大?。?/td> 335K
代理商： RP-21203F3-870
7
Data Device Corporation
www.ddc-web.com
RP-21200
Rev. C
Therefore, the Status 1 output can be used to determine if the
load is drawing more or less than a preset amount of current.
The Load Detection level can be programmed from >10% to <95%
of Rated Current using an external resistor connected between
the Programming Reference pin and Load Detection Program
pin. The 10% level can be achieved by simply connecting the
Programming Reference pin and the load Detection Program pin
together. The 95% level occurs when no connection is made to
the Load Detection Program pin.
The
STAR Series have been designed with a maximum Instant
Trip level of 3000% of Rated Current in order to protect the inter-
nal MOSFET switches from exceeding their rated junction tem-
peratures. In most cases, the user will elect to set the Instant Trip
level to the maximum by connecting the Instant Trip Program pin
to the Programming Reference pin. This will allow the greatest
possible inrush current without tripping for charging capacitive
loads, starting motors or energizing incandescent lamps.
In some applications, where there is no need to support high
inrush currents, the Instant Trip level can be set lower by adding
a resistor between the Instant Trip Program pin and the
Programming Reference pin. The lowest Instant Trip level of
200% can be set by leaving the Instant Trip Program pin open.
The most likely reason for setting a low Instant Trip level is to
minimize short-term voltage drops at the load due to high source
impedances. In other cases, the generator has its own circuit
breaker for protection and it’s better to trip an SSPC than the
generator.
When an SSPC is turned on into a short circuit, the output volt-
age cannot rise. However, the output current will rise rapidly until
the Instant Trip level is reached. Then the SSPC will turn off. The
maximum transient current will not exceed the Instant Trip level,
even if there is no circuit inductance, since the turn on time of the
MOSFET is controlled. Since the output voltage is still zero, the
output current will begin to decay as soon as the Instant Trip level
is reached. The time for the current to decay is determined by
5,000
3,000
1,000
200
100
LO
AD
CURRENT
%
I-MAX
0.001
0.01
0.1
1
10
145%
110%
TIME (SECONDS)
ALWAYS TRIP
0.0001
NEVER TRIP
MAXIMUM
INSTANT TRIP
MINIMUM
INSTANT TRIP
FIGURE 5. TYPICAL TRIP CHARACTERISTIC SETTINGS
the total circuit inductance and resistance. This is difficult to pre-
dict since the resistance of the internal MOSFET switch changes
as it turns off. In any case, the turn off time is always fast enough
to ignore for purposes of damaging the wire.
If there is considerable circuit inductance when an SSPC is
turned on into a short circuit, the risetime of the current will be
much slower than without inductance. Large load inductance
can stretch the risetime of the current to the point where the cur-
rent does not reach the Instant Trip level but intersects the I2t
curve instead. Again, this cannot damage the wire as the SSPC
will trip at that point to protect the wire.
If the SSPC is already on and a short circuit occurs, the SSPC
will trip, but the short circuit current will likely overshoot the
Instant Trip level. Again, the rate of rise of the current depends
on total circuit inductance. Since the SSPC is already on, the
current can, theoretically, rise in zero time if there is no induc-
tance. In the real world, there is always inductance which will
limit the risetime of the current although it can be quite fast.
As soon as the current reaches the Instant Trip level, the SSPC will
begin to turn off. However, since the SSPC is already on, there is
a delay until the gate-to-source voltage in the internal MOSFET
switch is reduced to the point where they begin to turn off. As a
result, the current keeps rising during that delay. How much the
current rises above the Instant Trip level is determined by the delay
and the risetime of the current. The RP-21200 Series of SSPCs
contain circuitry to reduce the delay at high currents. But, with lit-
tle circuit inductance, the current can reach up to 4000% of rated
current even if the Instant Trip level is set as low as 200%!
This possible high level of transient current is short-term. The
lower the circuit inductance, the higher the transient current but
the shorter the transient lasts. In all cases, the wire is protected
since the wire can withstand large overloads for short durations.
The only concern is possible system effects of having large,
short-term transient currents. Generator tripping is unlikely since
the transients are so fast.
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